Improvement in boeing-bus



i @Stetten tstse getest @ittica ,MELVI JINCKS, 0F DA-NV'ILLE, NEW YORK. vLetters Patent No. 63,392, elated April 2, 1867.

IMPROVEMENT IN BORING-BITS.

@te dgsmle merit tu in time rtttrs n'tmt zum mating nrt nt tige sume.

TO ALL WHOM IT MAY CONOERN:

Be it known that I, MELVIN JINCKS, of Danville, Livingston county, New York, have invented certain new and useful improvements in Countersinks; and I hereby declare that the following is a true, full, and exact description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon. i

Figure 1 represents aJ plan View of my countersink.

Figure 2 is :t similar View of the opposite side.

Figure 3 represents e side elevation of the gauge.

rThe letter A, in the annexed drnwings,represents the shank of my countersiuk, which is made `four square at th-e upper end and tapering so es to enter s, carpenters brace. The lower end ofthe shank A is for about an inch of the end made larger than the remaining portion, and is furnished with the two projections cl d, which are forged solid with the shank A. Through cach of the projections d an opening is made to receive into one opening the marker c, and into the other the cutter g. The marker c and cutter g ale.preveuted from having c, lateral motion by resting et bottom in a. longitudinal groove cut into the lower end of shank A. Both the Outtcrg and marker e are mede adjustable by screws s, which poss through the projections d. The marker e,`it wilhbe observed, terminates in n cutting edge which penetrates easily into the wood, while the cutter g, acting at right angles with marker c, reduces the borings er chips to such small proportions as that they easily escape upwards-by the action of the countcrsink. In the buck of marker e and cutter y an indentation, t, is made to facilitate their withdrew-nl from projections fZ. Into the lower end of shank Aa hole is medeto receive the gimlet-shziped bit m, which is coniined in its place by the screw n. One side of the lower end of shank A is scooped out, (as seen in iig. 2,) havingen oblique cutting edge at the point c. This scooped end is intended to receive and convey oif the borings collecte in the concave side of bit fm. Opposite the scoop, as above described, the end of shank A slopes down and forms e cutting edge :it thc point where 'the bit m enters the shank. In order to regulate the depth of the hole the geugef is provided. (See tig. The gaugefhas n longitudinal slot in it, through. which two screws pass and enter the shonli A. By this arrangement the gauge f een he adjusted to suit the wishes et" the operator.

In operati-ng my countersink a. hole will be cut by the cutting edges et the lower end of shank A, and will be enlarged by the marker eend cutter g. AThe depth of the hole will be regulated by suitably adjusting the sweet Having thus described my countersink,wl1at I claim, and desire to secure by Letters Patent, is-

The shank A., as constructed, in combination with gaugef, cutterg, marker c, and nu adjustable bit, sul tantially es and for the purpose described.

In testimony that I claim the foregoing as my own I hereby atti); my signature in the presence of two Witnesses.

MELVIN JINOKS.

Witnesses! O. ',IIoUsnY, S. D. Wnm'n. 

